python 操所sqlite3

__author__ = 'Administrator'

 import sqlite3,random

 src="qwertyuiopasdfghjklzxcvbnm"


 def get_str(x,y):

     str_sum=random.randint(x,y)

     astr=""

     for i in range(str_sum):

         astr+=random.choice(src)

     return astr


 def output():

     cur.execute("select * from mytab")

     for sid,name,ps in cur:

         print(sid," ",name," ",ps)

 def output_all():

     cur.execute("select * from mytab")

     for sid,name,pas in cur.fetchall():

         print(sid," ",name," ",pas)

 def get_data_list(n):

     res=[]

     for i in range(n):

         res.append((get_str(2,4),get_str(8,12)))

     return  res

 if __name__=="__main__":

     print("建立连接")

     con=sqlite3.connect(":memory:")

     print("建立游标")

     cur=con.cursor()

     print("创建一张表mytable")

     cur.execute("create table mytab(id integer primary key autoincrement not null,name text ,password text)")

     print("插入一条记录")

     cur.execute("insert into mytab(name,password) values(?,?)",(get_str(2,4),get_str(8,12),))

     output()

     print("批量插入数据库")

     cur.executemany("insert into mytab(name,password) values(?,?)",get_data_list(3))

     print("显示所有记录")

     output_all()

     print("更新一条记录")

     cur.execute("update mytab set name=? where id=?",("aaa",1))

     print("显示所有记录")

     output()

     print("删除一条记录")

     cur.execute("delete from mytab where id=?",(3,))#删除一条记录

     print("显示所有记录")

     output()

     cur.close()

     con.close()